Parallel thrust drive



Feb. 5 1952 H. w. DAHLY PARALLEL THRUST DRIVE Filed Dec. 2v. 1948INVENTOR. (m2 paid) #1; flfzaragy Patented Feb. 5, 19 52 UNITED STATES srssr OFFICE Hal W. Dahly, Chicago, Ill. Application December 27,1948,.Serial No. 67,445

9 Claims (CI. 74-40) This inventionrelates to means for reciprocating aplate in a frame and further to a parallel thrust drive and moreparticularly to a parallel thrust drive for a punch press andspecifically to a parallel thrust drive for a paper perforating presswhich is used to punch a row of hinge holes along respective edges ofloose leaf type pages for the engagement of conventional plastic coilpage connectors.

In punching operations of this class, it is necessary to perforate pagesof considerable length requiring punch shanks and dies of correspondingwidth and shanks being provided with a row of punches as long as sheetsof any length require, it being of course understood that such shank andpunches are usedin connection with dies having respective holes for theseveral punches. One of themajor problems in actuating a punch shankwith a set of punches so widely distributed i to provide in conjunctionwith a mounting and driving slide for the punchshank,

a mechanism which will restrict such shank to a parallel position inrespect to the die and likewise the paper being punched, and which willrigidly maintain this parallel relation through the working strokes ofthe shank.

It is a general object of the invention to provide spaced shank drivingmechanism for actuating each side of such shank and to provide a meansof operating same in unison from a single power receiving shaft.

It is a further object to provide mechanisms of this class operated froma single crank, driven by such shaft through oppositely extendingconnecting rods, which engage similarly arranged shank driving bellcranks, and to provide a means associating said bell cranks with suchshank for converting the radial movement of such bell cranks to anormally vertical shank driving action.

It is also an object to provide a mechanism of this class which isreadily assembled and disassembled for inspection, or for any other reason, and to provide a simple construction which may beeconomically'manufactured and which may be operated for a minimum costin upkeep. 1

The above and other objects are carried out by the structure illustratedin the accompanying drawing, in which Figure 1 is a plan view of theupper structure partly in section taken in the proximity of lineI-IofFigureS,

Figure 2 is a fragmentary sectional plan view taken in the proximity'ofline 2+ 2of Figure-"3,

Iii

Figure 3 is a fragmentary sectional view taken in the proximity of line33 of Figure 2, and

Figure 4 is a fragmentary sectional view taken in the proximity of line44 of Figure 3.

Similar characters of reference designate similar parts throughout thedrawing. Referring to Figure 1, the numeral I designates the frame ofthe machine which journals the driving shaft 2 upon which the drivepulley 3 is mounted at one end, and further associated with said shaftin driving same is a conventional press clutch 4, as will be understoodby those familiar with the art. The other end of said shaft extends tothe interior of the drive housing '5, and is provided with a crank pin6, which extends into said'housing. Said housing is somewhat elongated,being horizontally disposed and transverse to said shaft.

The housing 5 has forwardly terminating side walls I, which are cut awayto nest corresponding sides of the driving head or plate 8, said headbeing thus slidably retained by the gibs. 9 and screws Ill. Theextensiveness of said head is partly indicated by dot-and-dash lines I Iin Figure 3, it being essential to show in solid lines working partswhich would be otherwise concealed in that figure. Said head isconstructed at its lower edge with a punch shank engaging formation I2,which extends throughout its width. The punch shank I3 is provided witha corresponding'formation which interlocks with same, said shank beingslidably displaced in the guide I l, which is mounted on the base I5 ofthe frame I. Said shank is provided with downwardly extending punches I6 spaced at suitable intervals throughout its width indicated bydoubledot-and-dash lines I! of Figure 3. The die I8 is also supported onthe base I5 under said punches with its die holes I9 in working relationtherewith, said base being provided with an opening 20 through which thepunchings escape as understood by those familiar with the art.

It will be observed that in addition to performing its work in drivingthe punch shank I3, the drive head 8 serves as a closure for the housing5, being spaced from the back wall thereof a suitable distance forthelateral confinement of the block type bell cranks 2| and 22, located inrespective ends of said housing, said bell cranks being convenientlyfulcrumedby the pivot pins 23 which are mounted in the lower region ofsaid housing, through'the rear wall24, and retained by thewashers 25 andSCIBWSJ'YZG which hold the shoulders 21 of said pivot pins drawn ri idlyagainst the inner surface of said side wall.

Spaced co-directionally to the side of and parallel to respectivefulcrum pins 23, the pins 28 are disposed through holes in said bellcranks, said pins having enlarged portions engaging locks 2 which arefree to move rotatably thereon, said blocks being slidably disposed inthe horizontal grooves 36 of the drive head 8, and said enlargedportions being confined between the bottom of said grooves andrespective bell cranks for retaining said pins longitudinally.

Referring more particularly to Figure l and Figure 3, the inner ends ofthe oppositely extending connecting rods 3| and 32 engage the crank pin5 of the shaft 2. The straight rod '32 is centrally spaced between thedrive head 8 and rear housing wall 24 and is forwardly of the rod 3|,its outward end being confined in the upwardly disposed slot 33 of thebell crank 22, where it is engaged by the upper bell crank pin 34' andthe rod 3| is offset at 35 to bring its outward end into the slot 35 ofbell crank 2|, where it is engaged by the pin 3?.

From the foregoing it will be understood that when the connecting rods3| and 32 are actuated by the crank pin 6, the bell cranks 2] and 22 areswun co-direc'tionally moving the "drive head 8, by the pins 28 andblocks 29 by their engagement with the grooves as, that the punches 1Bare thus actuated through the shank [3, as previously described, andthat said head is thus maintained parallel to the base l5 when thusmoved.

The connecting rods 3| and 32 are retained on the pins by washer 38 andscrew as, omitted in Figure 3. The means for creating rockingmotioncomprise's connecting rods 3i and 32, bell cranks Hand '22, pins 32 and 3?, pivot pins 23 washers 25, and screws 2s. The means forconverting the rocking motion into reciprocatory motion comprises thepins 28 and blocks 29 engaging in the grooves 38 of the punch drivinghead 8.

The die-shoe M has sloping fore and aft oppositely beveled edges ll, theforward edge embracing the corresponding edge of the bar 43 againstwhich it is held by the gib clamps '44, which are fulcrumed on the pivotshaft 45. Said shaft is helddirectly on to the base 15 by screws 43,said gib clamps being cut away to allow for this, the remote end of eachgib being provided with a screw 47, downwardly against said base bywhich arrangement it will be seen that tightening of said screws willnose the other end oi the gibs against the inclined surface of thedieshoe 46, by which it is thus held in place against the bar 43.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. 1 therefore do not wish to be limited to the precise detailsof construction set forth, but desire to avail myself of such variationsand modifications as come within the scope of the appended claims.

The invention claimed is: V

1. A punch press embodying a frame with an elongated vertical wall, apair of spaced and similarly arranged bell cranks journaled to saidwall, a drive shaft journaled in said frame and having a crank pin whichprotrudes through said wall, connecting rods linking said crank pin withsaid bell cranks, a punch driving head slidably gibbed to said frame,and means associating said bell cranks with said head in operatingrelation thereto, whereby said head is moved by force from 4 said crankpin transmitted through said connecting rods to said bell cranks.

2. A punch press embodying a frame, a pair of spaced and similarlyarranged bell cranks journaled to said frame, said bell cranks havingaligned grooves, a drive shaft journaled in said frame and having acrank pin, connecting rods linking said crank pin with said bell cranks,one H end of each being disposed in one of said bell crank grooves, apunch driving head slidably gibbed to said frame, said head havinghorizontal grooves and means associating said bell cranks with saidgrooves in head driving manner.

3t In a punch press for punching a row of holes along the margins ofpaper sheets, a frame including a vertical Wall, a punch driving headparallel to and spaced from said wall and slidably mounted in saidframe, a shaft journalled in said wall substantially midway theextremities thereof, a crank pin drivably carried by said shaft anddisposed in the spacebetwe'en said head and wall, and means in saidspace for operatively conmeetin said crank pin to'said driving head atspaced'points" on the latter,

4. The combination with a frame, a base positioned normally of saidframe and secured thereto, a plate having a pair of grooves thereinpositioned normally of said base and mounted for re ciprocal movement insaid frame, of a means for reciprocating said plate and maintaining theend of said plate adjacent said base in parallel relation with said baseduring the reciprocal movement of said plate, said means comprising adrive shaft, a first means for creating rocking motion pivotallyconnected to said frame and means for creating rocking motion andslidably disposed in the other of said grooves.

5, The combination with a frame, a base positioned normally or saidframe and secured thereto, a plate positioned normally of said base andmounted for reciprocal movement in said frame, of a meansforreciprocating said plate and maintaining the end of said plate adjacentsaid base in ,parallialrlation with said base during thereciprocalmovement of said plate, said means comprisin a 'pair of bellcranks arranged in spaced relation with respect to each other and one ofsaid bell cranks being pivotally connected to said frame and the otherof said bell cranks being pivotally connected to said frame, a driveshaft positioned between said bell cranks and rotatably supported insaid frame, a first connecting rod having one end mounted on said driveshaft and having its other end pivotally connected to said one of saidbell cranks, a secand connecting rod having one end mounted on saiddrive shaft and having its other end pivotally connected to said otherof said bell cranks, a first means operatively connecting said one ofsaid bell cranks to said plate, andasecondmeans operatively connectingsaid other of said bell cranks to said plate.

6. The combination with a frame, a base positioned normally. of saidframe and secured thereto, a plate having a pair of grooves position'ednormally of said, base and mounted for reciprocal movement in saidframe, of a means for reciprocating said plate and maintaining the endof said plate adjacent said base in parallel relation with said baseduring the reciprocal movement of said plate, said means comprising apair of bell cranks arranged in spaced relation with respect to eachother and one of said bell cranks being pivotally connected to saidframe and the other of said bell cranks being pivotally connected tosaid frame, a drive shaft positioned adjacent said bell cranks androtatably supported in said frame, a pin ec-centrically positioned onthe adjacent end of said drive shaft and secured thereto, said one ofsaid bell cranks being operatively connected to said pin and said otherof said bell cranks being operatively connected to said pin, a firstblock pivotally connected to said one of said bell cranks and slidablydisposed in one of said grooves, and a second block pivotally connectedto said other of said bell cranks and slidably disposed in the other ofsaid grooves.

7. Means for reciprocally moving a plate in a frame, said meanscomprising a pair of bell cranks arranged in spaced relation withrespect to each other and pivotally connected to said frame, a driveshaft positioned adjacent said bell cranks and rotatably supported insaid frame and operatively connected to each of said bell cranks, afirst means operatively connecting one of said bell cranks to saidplate, and a second means operatively connecting the other of said bellcranks to said plate.

8. Means for reciprocally moving a plate in a frame, said meanscomprising a pair of hell cranks arranged in spaced relation withrespect to each other and one of said bell cranks being pivotallyconnected to said frame and the other of said bell cranks beingpivotally connected to said frame, a drive shaft positioned adjacentsaid bell cranks and rotatably supported in said frame, a pineccentrically positioned on the adjacent end of said drive shaft andsecured thereto, said one of said bell cranks being operativelyconnected to said pin and said otherof said bell cranks beingoperativelylc'onnected to said pin, a first means operatively connectingsaid one of said bell cranks to said plate, and a second meansoperatively connecting said other of said bell cranks to said plate.

9. Means for reciprocally moving a plate having a pair of groovestherein in a frame, said means comprising a drive shaft, a first meansfor creating rocking motion pivotally connected to said frame andoperatively connected to said drive shaft, a second means for creatingrocking motion arranged in spaced relation with respect to said firstmeans for creating rocking motion and pivotally connected to said frameand operatively connected to said shaft, a first block pivotallyconnected to said first means for creating rocking motion and slidablydisposed in one of said grooves, and a second block pivotally connectedto said second means for creating rocking motion and slidably disposedin the other of said grooves.

HAL W. DAI-ILY.

REFERENCES CITED Y The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

